fhueske commented on issue #6585: [FLINK-10172][table]re-adding asc & desc suffix expression
to expressionParser
URL: https://github.com/apache/flink/pull/6585#issuecomment-414936045
`asc` and `desc` are not regular functions. They are indicators for the sort order and
converted into special `Ordering` expressions. Without special treatment, they are converted
into `Call("asc", fieldRef)` and therefore not correctly handled by `Table.orderBy()` which
expects `Ordering` expressions.
This PR adds code that was (accidentially?) dropped when refactoring the `ExpressionParser`
in 9244106b334ef54ba3e39a3f2c0c76f46ae4ecd3.
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